Assist levels, displays and the programme in the controller

A display shows speed, assist level and state of charge. It also limits what you can change without a programming lead. Bafang cadence motors are famously programmable. That is useful and it is how a street motor becomes something else. The page on this site describes the configuration as sold. A different programme is a different build.

Practical settings

• Start on the lowest assist until the torque arm and the brakes have a week on them.
• Prefer a soft ramp over a high level if the sensor is cadence. It saves tyres and chains.
• Set the wheel size correctly or the speed on the screen is fiction.
• A walk-assist button is not a throttle, until someone has programmed it to behave like one.
• Replace a display with the same family. The connector can look identical and still be wrong.

Keep a photo of the screen’s about-page with the kit record in your garage. Firmware and wheel size are the two settings every later mechanic will ask for, and they are the two nobody remembers.